mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-10-29 11:05:43 +00:00
443 lines
10 KiB
C++
443 lines
10 KiB
C++
#ifndef EV_WIN32_HPP
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#define EV_WIN32_HPP
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#include <llarp/buffer.h>
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#include <llarp/net.h>
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#include <windows.h>
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#include <cstdio>
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#include <llarp/net.hpp>
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#include "ev.hpp"
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#include "logger.hpp"
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namespace llarp
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{
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struct udp_listener : public ev_io
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{
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llarp_udp_io* udp;
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// we receive queued data in the OVERLAPPED data field,
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// much like the pipefds in the UNIX kqueue and loonix
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// epoll handles
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WSAOVERLAPPED portfd;
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size_t iosz;
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udp_listener(SOCKET fd, llarp_udp_io* u) : ev_io(fd), udp(u)
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{
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memset((void*)&portfd, 0, sizeof(WSAOVERLAPPED));
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};
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~udp_listener()
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{
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}
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int
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getData(void* buf, size_t sz, size_t ret)
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{
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// make sure it's not too big
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if(sz < ret)
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return -1;
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iosz = ret;
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return read(buf, sz);
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}
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virtual int
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read(void* buf, size_t sz)
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{
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sockaddr_in6 src;
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socklen_t slen = sizeof(src);
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sockaddr* addr = (sockaddr*)&src;
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unsigned long flags = 0;
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WSABUF wbuf = {sz, static_cast< char* >(buf)};
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// WSARecvFrom
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llarp::LogDebug("read ", sz, " bytes into socket");
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int ret = ::WSARecvFrom(std::get< SOCKET >(fd), &wbuf, 1, nullptr, &flags,
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addr, &slen, &portfd, nullptr);
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// 997 is the error code for queued ops
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int s_errno = ::WSAGetLastError();
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if(ret && s_errno != 997)
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{
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llarp::LogWarn("recv socket error ", s_errno);
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return -1;
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}
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// get the _real_ payload size from tick()
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udp->recvfrom(udp, addr, buf, iosz);
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return 0;
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}
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virtual int
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sendto(const sockaddr* to, const void* data, size_t sz)
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{
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socklen_t slen;
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WSABUF wbuf = {sz, (char*)data};
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switch(to->sa_family)
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{
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case AF_INET:
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slen = sizeof(struct sockaddr_in);
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break;
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case AF_INET6:
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slen = sizeof(struct sockaddr_in6);
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break;
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default:
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return -1;
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}
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// WSASendTo
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llarp::LogDebug("write ", sz, " bytes into socket");
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ssize_t sent = ::WSASendTo(std::get< SOCKET >(fd), &wbuf, 1, nullptr, 0,
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to, slen, &portfd, nullptr);
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int s_errno = ::WSAGetLastError();
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if(sent && s_errno != 997)
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{
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llarp::LogWarn("send socket error ", s_errno);
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return -1;
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}
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return 0;
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}
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};
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struct tun : public ev_io
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{
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llarp_tun_io* t;
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device* tunif;
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OVERLAPPED* tun_async;
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tun(llarp_tun_io* tio)
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: ev_io(INVALID_HANDLE_VALUE)
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, t(tio)
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, tunif(tuntap_init())
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{
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};
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int
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sendto(const sockaddr* to, const void* data, size_t sz)
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{
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return -1;
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}
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void
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flush_write()
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{
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if(t->before_write)
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{
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t->before_write(t);
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}
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ev_io::flush_write();
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}
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bool
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do_write(void* data, size_t sz)
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{
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return WriteFile(std::get< HANDLE >(fd), data, sz, nullptr, tun_async);
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}
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int
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read(void* buf, size_t sz)
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{
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ssize_t ret = tuntap_read(tunif, buf, sz);
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if(ret > 4 && t->recvpkt)
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// should have pktinfo
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t->recvpkt(t, ((byte_t*)buf) + 4, ret - 4);
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return ret;
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}
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bool
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setup()
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{
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llarp::LogDebug("set ifname to ", t->ifname);
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strncpy(tunif->if_name, t->ifname, sizeof(tunif->if_name));
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if(tuntap_start(tunif, TUNTAP_MODE_TUNNEL, 0) == -1)
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{
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llarp::LogWarn("failed to start interface");
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return false;
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}
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if(tuntap_set_ip(tunif, t->ifaddr, t->ifaddr, t->netmask) == -1)
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{
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llarp::LogWarn("failed to set ip");
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return false;
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}
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if(tuntap_up(tunif) == -1)
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{
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llarp::LogWarn("failed to put interface up: ", strerror(errno));
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return false;
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}
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fd = tunif->tun_fd;
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tun_async = &tunif->ovl;
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if(std::get< HANDLE >(fd) == INVALID_HANDLE_VALUE)
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return false;
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// we're already non-blocking
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return true;
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}
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~tun()
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{
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}
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};
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}; // namespace llarp
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struct llarp_win32_loop : public llarp_ev_loop
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{
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HANDLE iocpfd;
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llarp_win32_loop() : iocpfd(INVALID_HANDLE_VALUE)
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{
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}
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~llarp_win32_loop()
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{
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if(iocpfd != INVALID_HANDLE_VALUE)
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::CloseHandle(iocpfd);
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}
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bool
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init()
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{
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if(iocpfd == INVALID_HANDLE_VALUE)
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iocpfd = ::CreateIoCompletionPort(INVALID_HANDLE_VALUE, nullptr, 0, 0);
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if(iocpfd == INVALID_HANDLE_VALUE)
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return false;
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return true;
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}
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// it works! -despair86, 3-Aug-18 @0420
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int
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tick(int ms)
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{
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// The only field we really care about is
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// the listener_id, as it contains the address
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// of the udp_listener instance.
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DWORD iolen = 0;
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// ULONG_PTR is guaranteed to be the same size
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// as an arch-specific pointer value
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ULONG_PTR ev_id = 0;
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WSAOVERLAPPED* qdata = nullptr;
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int idx = 0;
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BOOL result =
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::GetQueuedCompletionStatus(iocpfd, &iolen, &ev_id, &qdata, ms);
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if(result && qdata)
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{
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llarp::udp_listener* ev = reinterpret_cast< llarp::udp_listener* >(ev_id);
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if(ev && !ev->fd.valueless_by_exception())
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{
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llarp::LogDebug("size: ", iolen, "\tev_id: ", ev_id,
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"\tqdata: ", qdata);
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ev->getData(readbuf, sizeof(readbuf), iolen);
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}
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++idx;
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}
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if(!idx)
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return -1;
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else
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{
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result = idx;
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tick_listeners();
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}
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return result;
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}
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// ok apparently this isn't being used yet...
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int
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run()
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{
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// The only field we really care about is
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// the listener_id, as it contains the address
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// of the udp_listener instance.
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DWORD iolen = 0;
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// ULONG_PTR is guaranteed to be the same size
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// as an arch-specific pointer value
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ULONG_PTR ev_id = 0;
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WSAOVERLAPPED* qdata = nullptr;
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int idx = 0;
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int result =
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::GetQueuedCompletionStatus(iocpfd, &iolen, &ev_id, &qdata, 10);
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// unlike epoll and kqueue, we only need to run so long as the
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// system call returns TRUE
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if(result)
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{
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llarp::udp_listener* ev = reinterpret_cast< llarp::udp_listener* >(ev_id);
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if(ev && !ev->fd.valueless_by_exception())
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{
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llarp::LogInfo("size: ", iolen, "\tev_id: ", ev_id, "\tqdata: ", qdata);
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ev->getData(readbuf, sizeof(readbuf), iolen);
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}
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++idx;
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}
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if(!idx)
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return -1;
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else
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{
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tick_listeners();
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result = idx;
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}
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return result;
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}
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SOCKET
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udp_bind(const sockaddr* addr)
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{
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socklen_t slen;
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switch(addr->sa_family)
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{
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case AF_INET:
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slen = sizeof(struct sockaddr_in);
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break;
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case AF_INET6:
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slen = sizeof(struct sockaddr_in6);
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break;
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default:
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return INVALID_SOCKET;
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}
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DWORD on = 1;
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SOCKET fd = ::socket(addr->sa_family, SOCK_DGRAM, 0);
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if(fd == INVALID_SOCKET)
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{
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perror("WSASocket()");
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return INVALID_SOCKET;
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}
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if(addr->sa_family == AF_INET6)
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{
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// enable dual stack explicitly
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int dual = 1;
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if(setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (const char*)&dual,
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sizeof(dual))
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== -1)
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{
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// failed
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perror("setsockopt()");
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closesocket(fd);
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return INVALID_SOCKET;
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}
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}
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llarp::Addr a(*addr);
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llarp::LogDebug("bind to ", a);
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if(bind(fd, addr, slen) == -1)
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{
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perror("bind()");
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closesocket(fd);
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return INVALID_SOCKET;
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}
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llarp::LogDebug("socket fd is ", fd);
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ioctlsocket(fd, FIONBIO, &on);
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return fd;
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}
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bool
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close_ev(llarp::ev_io* ev)
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{
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// On Windows, just close the socket to decrease the iocp refcount
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// and stop any pending I/O
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BOOL stopped =
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::CancelIo(reinterpret_cast< HANDLE >(std::get< SOCKET >(ev->fd)));
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return closesocket(std::get< SOCKET >(ev->fd)) == 0 && stopped == TRUE;
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}
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llarp::ev_io*
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create_udp(llarp_udp_io* l, const sockaddr* src)
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{
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SOCKET fd = udp_bind(src);
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llarp::LogDebug("new socket fd is ", fd);
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if(fd == INVALID_SOCKET)
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return nullptr;
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llarp::udp_listener* listener = new llarp::udp_listener(fd, l);
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l->impl = listener;
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udp_listeners.push_back(l);
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return listener;
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}
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llarp::ev_io*
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create_tun(llarp_tun_io* tun)
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{
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llarp::tun* t = new llarp::tun(tun);
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if(t->setup())
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return t;
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delete t;
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return nullptr;
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}
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bool
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add_ev(llarp::ev_io* ev, bool write)
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{
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uint8_t buf[1024];
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llarp::udp_listener* udp = nullptr;
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llarp::tun* t = nullptr;
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ev->listener_id = reinterpret_cast< ULONG_PTR >(ev);
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memset(&buf, 0, 1024);
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switch(ev->fd.index())
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{
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case 0:
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udp = dynamic_cast< llarp::udp_listener* >(ev);
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if(!::CreateIoCompletionPort((HANDLE)std::get< 0 >(ev->fd), iocpfd,
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ev->listener_id, 0))
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{
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delete ev;
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return false;
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}
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::ReadFile((HANDLE)std::get< 0 >(ev->fd), &buf, 1024, nullptr,
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&udp->portfd);
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break;
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case 1:
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t = dynamic_cast< llarp::tun* >(ev);
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if(!::CreateIoCompletionPort(std::get< 1 >(ev->fd), iocpfd,
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ev->listener_id, 0))
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{
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delete ev;
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return false;
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}
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::ReadFile(std::get< 1 >(ev->fd), &buf, 1024, nullptr, t->tun_async);
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break;
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default:
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return false;
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}
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return true;
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}
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bool
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udp_close(llarp_udp_io* l)
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{
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bool ret = false;
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llarp::udp_listener* listener =
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static_cast< llarp::udp_listener* >(l->impl);
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if(listener)
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{
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ret = close_ev(listener);
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l->impl = nullptr;
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delete listener;
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// std::remove_if
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auto itr = udp_listeners.begin();
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while(itr != udp_listeners.end())
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{
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if((*itr) == l)
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itr = udp_listeners.erase(itr);
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else
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++itr;
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}
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}
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return ret;
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}
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bool
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running() const
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{
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return iocpfd != INVALID_HANDLE_VALUE;
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}
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void
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stop()
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{
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// still does nothing
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}
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};
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#endif
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